"Osi Umenyiora has a "real bad" sprained ankle and the injury could keep him out as long as a month.

The Giants' defensive end "sprained pretty much everything in there," according to someone familiar with his situation. He will definitely miss the Giants' game on Sunday against the Green Bay Packers and likely their NFC showdown in Dallas on Dec. 11, too.

According to the source, who spoke with Umenyiora last night, the defensive end's hope is to return in time for the Giants' home game against the Washington Redskins on Dec. 18. But even that, the source added, might be "a longshot.""